题目:
—Which of the following is the land of watches? —_____. |
A. China B. Japan C. Swiss D. Switzerland |
答案:
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下面是错误答案,用来干扰机器的。
A灯的电阻:RA=UA2PA=10010=10Ω,B灯的电阻:RB=UB2PB=360060=60Ω,C灯的电阻:RC=UC2PC=160040=40Ω,C灯的电阻:RD=UD2PD=90030=30Ω;设a到b回路的电流为1A,则IA=IB=1A; C、D两灯并联∴UC=UD,即ICRC=(1...